Selector system for printing telegraph apparatus



June 25, 1946. G. s. SAYLOR SELECTOR SYSTEM FOR PRINTING TELEGRAPH APPARATUS 2 Sheets-Sheet 1 Filed Sept. 2, 1944 INVENTOR. Qfl vvt BY June 25, 1946. G. s. SAYLOR 2,402,671

SELECTOR SYSTEM FOR PRINTING TELEGRAPH APPARATUS Filed Sept. 2, 1944 2 Sheets-Sheet 2 INVENTOR.

I W I 9M QSIhM (54?60/4/ Patented June 25, 1946 UNITED STATES PATENT OFFICE SELECTOR SYSTEM FOR PRINTING TELEGRAPH APPARATUS 20 Claims. 1

My invention relates broadly to printing telegraph systems and more particularly to an improved method and apparatus for operating the selector system mechanism of a printing telegraph system.

One of the objects of my invention is to provide a method of operating the selector mechanism of a printing telegraph system in which the operation of the selector is separated from the control of the drive of the main shaft for speeding up the two functions and increasing the margin of reliability thereof.

Another object of my invention is to provide auxiliary electromagnetic means for controlling the operation of the main shaft of a printing telegraph system in coordination with the electromagnetic means employed, for operating the selector mechanism.

Still another object of my invention is to provide an arrangement of electromagnetic means operating alternately with the operation of the electromagnetic selector mechanism of a printing telegraph apparatus for electromagnetically controlling the operation of the main shaft of a printing telegraph apparatus as distinguished from the mechanical control thereof by the same means which operates the selecting mechanism.

Still another object of my invention is to provide a method of operating a printing telegraph system in which the marking and spacing sides of the main relay are employed to respectively control coacting electromagnetic means which separately control the selecting mechanism and the trip latch controlling the operation of the main shaft of the printing telegraph apparatus.

Other and further objects of my invention reside in the coaction of separate electromagnetic mechanisms in a printing telegraph circuit operating to speed up and increase the margin of response of the printing telegraph mechanism of signal impulses as set forth more fully in the specification hereinafter following by reference to the accompanying drawings in which:

Figure 1 is a side elevational view of a standard selector mechanism for a printing telegraph apparatus with the auxiliary electromagnetic control mechanism applied thereto for operating the trip latch and controlling the rotation of the main shaft in coaction with the operation of the selector mechanism; Fig. 2 is a top plan view of the range finder of the selector mechanism showing the auxiliary electromagnetic mechanism mounted with respect thereto; Fig. 3 is a fragmentary end elevational view of the auxiliary electromagnetic trip latch control mechanism,

the view being taken substantially on line 3-3 of Fig. 1; Fig. 4 is a fragmentary end elevational view of the armature of the auxiliary electromagnetic control mechanism looking in the direction of line 4-4 of Fig. 1; Fig. 5 is a fragmentary vertical sectional view taken on line 5-5 of Fig. 1 illustrating the adjusting means for restrictin the movement of the trip latch in the improved mechanism of my invention; Fig. 6 is a schematic view of the selector control mechanism and illustrating the engaged position of the trip latch for arresting movement of the main shaft and showing the position of the auxiliary electromagnetic mechanism of my invention when the auxiliary electromagnetic windings are de-energized; Fig. '7 is a view similar to the view shown in Fig. 6 but illustrating the auxiliary electromagnetic mechanism energized and showing the restricted movement which is permitted of the trip latch of the selector control mechanism; and Fig, 8 is a schematic wiring diagram illustrating the arrangement of the selector magnets and the auxiliary trip latch control magnets in a typical printing telegraph circuit.

My invention is applicable to the standard selector mechanism of printing telegraph equipment of the tape type; the reperforator type of both printing and non-printing varieties; and the page type. I have illustrated my invention in connection with the selector mechanism developed by Teletype Corporation and used in printing telegraph apparatus known as Teletype. It is not my intention to claim as my invention any features of the selector of the Teletype mechanism per se except to show the system of my invention applied to the Teletype Corporation selector mechanism with special additions which I have devised and Which I have found after extended tests to be highly practicable in increasing the margin of reliable operation of Teletype apparatus and permitting high speed operation thereof. With the auxiliary electromagnetic control mechanism of my invention and the special adjustment devices hereinafter referred to in more detail, I have successfully operated printing telegraph apparatus over long periods of time at speeds of approximately one hundred Words per minute with perfect operation, Ordinarily such apparatus operates at speeds equivalent to sixty words per minute and in speeding up the operation of such equipment the range of reliability is reduced, However, with the auxiliary control mechanism of my invention applied to standard selector mechanism, I have accomplished an increase in the range of reliability of operation for continuous operation of the mechanism at approximately one hundred words per minute.

In carrying out my invention I have found it essential to decrease the inertia of moving parts and restrict the limits of travel of the parts and to assist the movement thereof by auxiliary means not heretofore contemplated in the art. Among other things I improve the operation of the selector mechanism by mounting on "the range finder plate a support carrying an auxiliary electromagnet with pivoted armature. The pivoted armature of the electromagnet projects into the I The trip plunger normally operates a bell crankwhich in turn operates a stop pawl latch. The stop pawl latch projects to a position in which the end of the latch is engaged with the stop pawl. I introduce a special; adjusting means which I mount in the-stop pawl plate accessible from the exterior of the'range finder plate for restricting the movement of the stop pawl latch materially reducing the stroke thereof in a disengaged direction'while not disturbing the movement thereof in theengaging position.

Thus movement imparted to the trip plunger is communicated through the bell crank to the stop pawl'latch. Inasmuch as the stroke of the stop pawl latch is restricted excessive travel of the trip plungermay be reduced thereby speeding u the operation of these parts. In other words the latch is prevented from excessive over-travel, such over-travel consuming extended time detrimental to the high speed operation of the parts.

The windings of the auxiliary electromagnet are connected in circuit with the spacing contacts of theline relay as distinguished from the connection of the selector magnet in circuit with the marking contacts of the line relay. Accordingly when the selector magnet winding is energized, the Winding to the auxiliary electromagnet is deenergized and vice versa.

The selector magnet controls the main armature which controls the angular movement of the swords of the selector mechanism. Upon the transmission of a start pulse the line, relay moves from the marking side, deenergizing the selector magnets and in its movement from the marking side on passing to the spacing side imparts energy to the auxiliary electromagnet relays. The energization of the auxiliary electromagnet serves to attract the armature thereof. The adjustment screw thereof moves the trip latch which imparts movement to the bell crank shifting the stop pawl latch out of engagement with the stop pawl and allows the main. printer shaft to revolve. The main shaft, having been initiated in motion, makes one complete revolution representative of the initial spacing pulse and remains in that position preparatory to receipt of the next signal pulse. Movement of the main armature of the selector magnet which controls the angular position of the swords is coordinated with the movement of the auxiliary electromagnets which serve to positively operate the stop latch pawl.

In other words the armature operated by the main selector magnet has heretofore been depended upon to perform both the function of operating the swords and the function of operating the trip latch. I separate these two operations. The sluggishness of the main armature is eliminated in the arrangement of my invention. The margin of operation employing the mechanism of my invention has beenincrea'sedapproximately twenty points or more overthat' obtainable heretofore. I eliminate those infinitesimal time periods which when integrated constitute appreciable delay periods by electrically controlling the trip plunger and the stoppawl latch as distinguished fromthe mechanical control of the trip plunger through the agency of the same armature operated bythe selector magnet which must also do the work of controlling the swords. Thus I divide the work which is to be done in the selecting mechanism into separate divisions, one of which is constituted by the main selector magnet which controls the movement of, the swords and the other. of which controls through auxiliary,

electromagnetic means the operation of the stop pawl latch for releasing the main shaft.

There is a movement of approximately forty thousandths of an inch of the armature of the selector magnet in moving from the marking to the spacing position, whereas the line relay armature in traveling from the marking to the spacv ing side, and thus energizing the auxiliary electromagnet winding causing the movement of the trip plunger, and consequently the starting of the main shaft, has a movement of approximately six one-thousandths of an inch. It is, therefore, apparent that a quicker action isobtained by electrically driving the trip plunger than is obtained by mechanically driving the trip plunger through the same means which is depended upon for initiating the selection function.

In the circuit of the selector magnet I increase the current supply to approXimately. eighty-five to ninety-five milliamperes as compared'to current values of seventy milliamperes heretofore generally employed. I accomplish this with the adjustably balanced resistance network.

In addition to the change of the selector principle heretofore employed, by I separating the functions of selection and stop pawl latch control in a tape bar printer of the tape type, I also provide means for preventing. excessive travel of the main bail of the type bar control mechanism..

. iting the upward travel of the main bail this objection was overcome. Also it was found that increased main bail spring tension was necessary for the proper function of the spacing mechanism which previously had been erratic in operation. By decreasing the length of the stroke of the main bail very substantial reduction in vibration is observed. By shortening the stroke of the main bail, there is a substantial saving in the time period required by the main bail in its travel from its extreme lower position to its movement in the opposite direction or the extreme upper position.

Referring to the drawings in detail reference character I designates the stop pawl plateof the selector mechanism on which there is mounted the-range scale 2 shown more clearly in Fig. 2' and over which the clampingplate 3 may besel'ectively moved about pivot screw-4 and; secured in adjusted position by means of clamping screw 5. The stoppawl plate supports the journaling means 5 for the stop pawl latch I asshown at I3. The'stop pawl latch is formed integrally with the trip latch shown at 9 having a shoulder I and face II thereon arranged to engage with the stop pawl I2. The stop pawl I2 is pivotally mounted on screw I4 which i carried in the stop pawl plate I. The stop pawl I2 is normally biased by spring I which connects to post I6 carried by stop pawl plate I. A stop lever eccentric screw ll carried by stop pawl plate I serves as an abutment for the stop pawl which is constantly urged thereagainst by spring I5 while being free to-shift angularly in the opposite direction when released by movement of the trip latch 9 to-the position illustrated" in Fig. 7. When the stop pawl is released by the trip latch 9 it is free to shift angularly to a position which allows the stop arm I8 of the selector cam sleeve assembly I9 to revolve. The stop lever which forms an extension on the extremity of the stop pawl is represented at 20. The stop lever 2!! when maintained in the position latched by the trip latch S-serves as an. abutment or obstruction against the rotation of stop arm I8, but when trip latch 9 moves to the position illustrated in- Fig. 7, stop lever is free to be shifted angularly out of the path of the stop arm l8 permitting the cam sleeve assembly I9 to revolve and thus allowing the main shaft associated with the cam sleeve assembly I9 to revolve for carrying out the functions of the printer mechanism.

The trip latch 9 pivoted at 8 is operated by the stop pawl latch I which is integral therewith under control of the bell crank 2| which is pivotally mounted at 22 with the end ZIa thereof bearing against the stop pawl latch l on the end 2I'b' thereof engageable by the head of the trip plunger 23. The bell crank 24 pivotally mounted at 22 is supported in bracket 24 which is attacl'ied to range scale plate 2. a slidable mounting for the trip latch plunger 23. Trip latch plunger 23 has a head 23a thereon which establishes abutting contact with the end ZIb of bell crank ZI which when pushed to the left as indicated in Fig. 7 tends to rock bell crank 2| about pivot 22 imparting movement to stop pawl latch I and rocking trip latch 9 about pivot 8 away from the path of movement of stop pawl I2 whereby shoulder Ill and face II are disengaged from the stop pawl I2 allowing stop ieverzil to be moved out of the path. of stop arm I3 permitting rotation of the cam sleeve assembly I9. However, the limit to which trip latch 3 may move is closely regulated in the arrangement of my in" vention by means of a finely threaded stop screw which is threaded through the stop pawl plate I directly over the trip latch 9. The adjustable screw 25 has an adjusting head 2.5a thereon. which permits substantial micrometer adjustment of the stop screw for restricting movement of trip latch 8 toward the stop pawl plate I. When suflicient movement is obtained to allow stop pawl I2 to be moved by the force of spring I5 out of engagement with shoulder Illv and face I I of trip latch 9 and against the constant resistance of spring 25, a lock nut 25b is tightened against stop pawl plate I firmly securing stop screw 25in position against the intermittent vibration ofiered by the operation of the selector mechanism. and associated Bracket 24 also provides printer mechanism. As the range finder is oriented the stop pawl latch I shifts angularly under the operating end 2Ia of bell crank 2| so that the trip latch is eilectively operated within the limits defined by the end of stop screw 25 and the stop pawl I2 in any angular position of the range finder.

The trip plunger 23 is operated by the end of the adjustable screw 21 carried in armature 28 of the auxiliary electromagnetic operating mechanism shown at 29. The auxiliary electromagneti Operating mechanism 29 is carried by a bracket member of magnetic material 30 having a foot 3i which is secured by a suitable screw device 32 to the range scale 2. The range scale 2 is formed from magnetic material as is also the bracket 24 toprovide a path for the magnetic flux through the trip plunger 23 and the adjustable screw 21 and pivotally mounted armature 28 as represented by the arrow lines in Fig. 8. The armature 28 is pivotally mounted at 33 through an aperture 34 extending through the main magnetic fram 36 of the auxiliary electromagnetic mechanism. The armature member 28 projects beyond the magnetic bracket 36 as represented at 28a and serves as a bearing surface against which the adjustable screw 35 which is carried in the angular extension 36a of the magnetic frame 36 may be adjusted. The adjustable screw 35 is provided with a knurled head 35a and 350 for selectively abutting the extension 2811 of armature 28 for limiting the stroke of the armature in the direction of the pole pieces 29a of the auxiliary electromagnetic mechanism 23 and correspondingly controlling the travel of adjustable screw 21 toward trip plunger 23. Thus an accurate control of tolerances is secured for high speed operation of the selector mechanism. The adjustable screw 21 when adjusted in operating position on armature 28 is subsequently locked in such position by means of lock nut 21b. The armature 2B is limited in its stroke awa from the pole pieces 29a b means of adjustable screw 31 which passes through the extension bracket 38 that projects from magnetic bracket 39. Screw device 33 serves to fasten extension member 38 to magnetic bracket 30. This same screw device may be utilized to clamp the magnetic supporting strip 4!! which constitutes the mounting mean for the magnetic frame 36 of the auxiliary electromagnetic mechanism with respect to bracket 30.

The extension 38 also provides a support for the strip member 4! secured thereto by screw means Ma and depending downwardly from extension 38 to provide a support for adjustable screw 42. Adjustable screw 42 has a knurled adjusting head 42a and a lock nut 42b thereon for maintaining the screw in adjusted position. The end of the adjustable screw 42 is flattened at 420 to form a connecting means for the coil spring 43 which is secured to armature Z8 tending to maintain armature 28 in the limiting position determined by the adjustable stop screw 31. The adjustable stop screw 31 has a knurled head 31a thereon and a lock nut 31b operating thereon for fixing the position of adjustable screw 31 when th operating limits of the armature are finally determined.

The magnetic flux through the main frame 36 of the auxiliary electromagnetic operating mechanism passes through supporting strip 49 and the magnetic bracket 30 and through the angle support 31 thereof through range scale 2, bracket 24, adjustable screw 21, armature 28 and the pivotal mounting. 33 thereof in main magnetic'frame 36, thus forming a closed magnetic path. The trip latch plunger 24 is thus magnetically attached to adjusting screw 21 which is formed from magnetic material and as armature 28 moves away from pole pieces 29a upon deenergization of the windings of the auxiliary electromagnetic operating mechanism 29 under control of spring 43, the trip plunger 23 is dragged outwardly by the magnetic attraction of magnetic screw 21 on the end of the trip plunger 23. Accurateadjustment of the screw 21 is effected by moving head 21a and adjusting lock nuts 21b and 210. The clearance between trip plunger 23 and the end of the adjustable screw 21 when thearmature is unenergized is very slight and may vary from .001" to or -.003. This distance is usually adjusted for the best operating clearance.

' The spring 43 shown in Figs. 1 and 8 to pull the armature 28 against the back stop screw 31 when the magnets 29 are unenergized is adjusted to secure the correct tension, for high speed operation. The tension of spring 43 as well as the clearance between the end of adjustable screw 21 and trip plunger 23 when the two parts are separated from their normal magnetic attraction drag have an optimum Setting which are determined at the time that adjustments of the se lector mechanism are made. The stop screw 25 which serves as the limiting back-stop for the trip latch 9 is locked in place by lock nut 25b after adjustment by turning head 25a. to preclude overtravel of the trip latch 9' after a predetermined settin has been adopted as correct for high speed operation. The adjustment will always allow the trip latch 9 to unlatch and the over-travel will vary from approximately .001 to .003 but the stop screw 25 is locked in position when the best operating position is found. Usually just a perceptible over-travel after unlatch is the best adjustment. The adjustment provided by adjustable screw prevents the armature 28 from hanging in energized position with respect to pole pieces 29a of the auxiliary electromagnetic mechanism and thereby introducing infinitesimal time delays which when accumulated reduce the operating time of the associated selector and printing mechanism. It is recognized that the trip latch. 9 is restricted by stop screw 25 and that over-travel of the armature is inherently prevented by this method. However, on occasions the trip latch 9 has been observed to bounce under these conditions so that it is advisable to introduce the additional adjustment 35 to restrict the movement of the armature 28 independently of the restriction imposed upon latch 9 by stop screw 25. The trip latch 9 should only be restricted in its movement after the full stroke of the armature 28 has been reached in order to obtain maximum working efiiciency and margin in the selector mechanism.

The main selector magnets of customary construction are represented at :44 mounted in the usual manner with respect to the stop pawl plate I for controlling the movement of main armature 45 against the tension of armature spring 46. Armature 45 controls the movement of the armature extension represented at 41 which controls the movement of the selector levers represented at 48. The selector levers coact in the usual manner with the selector cam sleeve represented at IQ for controlling the revolution of the driving member that coacts with the driven member through the clutch mechanism associated with the main shaft. The armature 45 operates to efiect various permutations and combinations of the selector levers 48 in accordance with the signal impulses which excite the windings 44 of the selector magnets. Because the stop arm I 8 which is connected to the selector cam sleeve representedflat |9 is engaged with the stop pawl represented at 2|], the cam sleeve I9 is prevented from rotating. When the start impulse which is a spacing (no current) impulse is received in windings 44, main armature 45 is released and pulled away from the selector magnet pole by armature spring 46. This releases the stop arm so that the cam sleeve I9 is free to revolve with the main shaft.

Fig. 8 schematically shows the arrangement of the windings 44 of the selector magnet in circuit with the line relay. I have represented the signalling line at 50 connected to the line and bias windings of the line relay designated at 5|. The line relay terminals are represented at I, 2', 3', 4, 5, 6', 1' and 8'. The bias winding is represented at 2-|' and the line winding at 3'-6'. The relay tongue or armature is represented at 52 movable under control of the line and bias windings to either marking contact 53 or spacing contact 54. The circuit through the selector magnets 44 is completed through variable resistor 55, marking contact 53, movable armature 52 to negative potential as represented by connection 56. The opposite side of the windings 44 of the selector magnets is connected to positive potential represented at the connection 51. The .bias circuit is balanced by potentiometer 58 connected between the positive side of the D0,! tential source as indicated at 5'! and the bias winding 2'-|' of the polarized relay 5|. The spacing circuit of the relay 5| includes the connection from negative potential 56 through contact 54 and movable contact arm 52 to the windings 29 of the auxiliary electromagnetic mechanism through the adjustable resistor 59. The circuit is completed from windings 29 of the auxiliary electromagnetic operating, mechanism to the positive potential side of the circuit as represented at 57. As heretofore explained, the total distance of travel of the relay armature 52 between marking contact 53 and spacing contact 54 is approximately six thousandths plunger 23.

(.006") of an inch as distinguished from the total distance of travel of the selector magnet armature 45 of approximately forty thousandths (.040") of an inch. Accordingly when relay tongue 52 passes from marking contact 53 to spacing contact 54, the main selector magnet windings 44 are deenergized and the auxiliary magnet windings 29 energized in a time period faster than has heretofore been possible when depending upon an armature extension on armature 45 for effecting operation of the trip latch magnetic windings 29 results in the immediate movement of screw 21 endwise against trip plunger 23, moving bell crank 2| through arm 2|b thereof to the position illustrated in Fig. 7. Arm 2 la of bell crank 2| bears against stop pawl latch to the locking trip latch 9 about pivot 8 which moves against the yielding resistance of spring 26 to the position limited by abutment with stop screw 25, raising shoulder |Oand face out of engagement with stop pawl l2, thus allowing stop lever 20 to be moved out of the path of stop arm l8 permitting rotation of thecam sleeve assembly l9. This rotation is effected in a time period shorter than such rotation would be allowed by mechanical release of stop lever 20.

The closed magnet circuit extending through The excitation of auxiliary electro-v the magnetic parts constituted by the trip plunger 23, adjusting screw 21-, armature '28, frame 36, mounting strip 40, bracket 30, foot 3| and range scale plate 2 enables the adjusting screw 21 to remain magnetically attached to tripplunger 23. The trip plunger 23 is accordingly reciprocated under magnetic control in supporting bracket 24 and isuwithdrawn positively from contact with bell crank arm Zlb of bell crank 2|, again conserving infinitesimal units of time for facilitating higher speed operation of the mechanism. Moreover, the magnetic coupling thus provided prevents, chattering of parts and insures speedier operation inasmuch as screw 21 is continuously in magnetic contact with the end of tripplunger 2,3.

Thepermutations and combinations established between selector levers 48 under control of the selector magnet armature 45 may thus be effected in coordination with the excitation of the auxiliary electromagnetic, operating mechanism 29 for speeding up the shaft rotation release mechanism in proper sequence with the operation of the selector permutation and combination functions.

The adjustable balancing resistors in the relay the relay circuit in association with the windings 44 of the main selector 44 and windin s 29 of theauxiliary electromagnet. t

The selector cam 19 after rotating to a position ,in line with the fifth pulse selector lever indicated at 48 and should the fifth pulse as sent out over the main selector armature 45 has travelled approximately forty-thousandths of an inch (.040") backto the marking or closed circuit side. The

measurements recited herein (0%") and (.040") represent a time factor. Withmy invention the relay must travel less, than .001" to cause an open circuit in the auxiliary magnet windings 29 allowing the latch to be in a position to stop the main selector cam [9 any time thereafter. This secondary action of stopping the main shaft and also the quicker action in allowing the main shaft to start as heretofore stated will permit the broadening of the main cam sleeve projections indicated generally at 19, so that in passing over the selector levers 48 thus allowing an increase of time for the operation of the selector levers '48 and therefore an operating margin. still greater than heretofore mentioned will be allowed. Increase of speeds up to 150 words per minute or more may thus be obtained with the selector mechanism provided with an auxiliary electromagnetic system as described herein.

In order tomore fully understand the details of operation of the standard selector mechanism and the associated printing telegraph mechanism which normally coacts therewith, reference is made to Letters Patent No. 1,783,382 granted Dev cember 2., 1930, to Howard L. Krum and assigned to Teletype Corporation for Electric selector mechanism.

I have found the system of my invention highly :practical in speeding up the functions of the selector system of printing telegraph mechanism for continuous 100 words per minute operation,

10 I. realize, however, that modifications may be made in the arrangement of the mechanism and theassociated circuit and I intend no limitations upon myinvention otherthan maybe imposed by the scope of the appended claims.

What I claim and desire to secure by Letters Patent, of the United States is as follows:

Selector mechanism. comprising in combination with a rotary drive mechanism and a permutation and combination control mechanism, electromagnetic means, an armature device movable under control of said electromagetic means between opposite limits of travel for selectively operating, said permutation and combination control mechanism a two circuit relay having one circuit thereof connected to control the operation of said electromagnetic means and auxiliary electromagnetic means connected with the other circuit of said relay and operative alternately with respect to the operation of said first mentioned electromagnetic means and while said armature device ismoving between said limits of travel for controlling the movement of said rotary drive mechanism.

2'. In a printing telegraph system a, line relay having an operating winding and contactor, said contactor being movable to either a marking or spacing position, a rotary drive mechanism, a permutation and combination control mechanism, an electromagnetic actuator associated with said permutation and combination control mechanism and included in circuit with the marking position of said relay, an armature member movable between two limiting abutments and controlled by said electromagnetic actuator for operating said permutation and combination control mechanism, an auxiliary electromagnetic actuator associated with said rotary drive mechanism and" included in circuit with the spacing position of saidrelay and alternately controlling said rotary drive mechanism with respect to the operation of said permutation and combination mechanism during thetime period said armature member is traversing the path between the said limiting abutments.

3. In a printing telegraph system a line relay having marking and spacing windings, an armaturemovable to marking and spacing contacts, a selector mechanism including a magnetic actuator and anelectromagnetic winding connected in circuit with said marking contact, an auxiliary electromagnetic mechanism having a winding connected in circuit with said spacing contact, a

rotary drive mechanism, a permutation and com- 56 binationcontrol mechanism, said magnetic actuator being operated by said first mentioned electromagnetic winding through a linear path between two opposite limiting abutments for controlling said permutation and combination control mechanism and means operated by said auxiliary electromagnetic mechanism for controlling the rotation ofsaid rotary drive mechanism during the time period that said magnetic actuator is traversing the linear path between the opposite limiting abutments.

431 11 a printing telegraph system a line relay having marking and spacing windings, an armature movable to marking and spacing contacts, a mechanical selector mechanism including a magnetic armature and an electromagnetic winding connected in circuit with said marking contact, an auxiliary electromagnetic mechanism having a winding connected in circuit with said spacing contact, a rotary drive mechanism, a permutation and combination control mechanism, said mag- 11' netic armature being operated by said first mentioned electromagnetic winding through a path of movement restricted by two limiting abutments for controlling said permutation and combination control mechanism, means operated by said auxiliary electromagnetic mechanism for controlling the rotation of said rotary drive mechanism during the time period that said magnetic armature is traversing the distance between said limiting abutments and means for balancing the electrical circuits through said marking and spacing windings of said line relay.

5. Selector mechanism comprising in combination with a rotary drive mechanism and a permutation and combination control mechanism, electromagnetic means, an armature member operated by said electromagnetic means between two limits of travel for selectively operating said permutation and combination control mechanism, auxiliary electromagnetic means, an armature member operated by said auxiliary electromagnetic means for controlling said rotary drive mechanism and means for alternately energizing each of said electromagnetic means in accordance with permutations and combinations of a signalling code for effecting movement of said second mentioned armature member before said first mentioned armature member reaches its limit of travel.

6. Auxiliary control mechanism for printing telegraph apparatus comprising in combination with a mechanical selector mechanism including a selector magnet and permutation and combination mechanism controlled thereby, a trip plunger and bell crank mechanism, a frame structure for mounting said trip plunger for reciprocative movement with respect to said bell crank mechanism, said frame structure and trip plunger being formed from magnetic material, a magnetic frame supported on said frame structure, an electromagnetic system independent of said selector magnet supported by said magnetic frame, a magnetic armature pivotally mounted in said magnetic frame, an adjusting member of magnetic material carried by the end of said armature in axial alignment with said trip plunger and means for regulating the movement of said armature under control of said electromagnetic system in alternate timed relation to the operation of said selector magnet;

'7. An auxiliary control mechanism for printing telegraph apparatus comprising in combination with a mechanical selector mechanism including a selector magnet and permutation and combination mechanism controlled thereby, a trip plunger and. bell crank mechanism, a frame structure for mounting said trip plunger for reciprocative movement with respect to said bell crank mechanism, said frame structure and trip plunger being formed from magnetic material, a magnetic frame supported on said frame structure, an electromagnetic system independent of said selector magnet supported by said magnetic frame, a magnetic armature pivotally mounted in said magnetic frame, an adjusting member of armature in axial alignment with said trip plunger, means for regulating the movement of said armature under control of said electromagnetic system including adjustable limiting stops for governing the distance of travel of said armaber carried adjacent the end of said armature ,magnetic material carried by the end of said 12 maintains magnetic coupling with respect to said trip plunger for reciprocating said trip plunger with respect to said frame structure.'

8. In a printing telegraph apparatus a frame structure, a mechanical selector mechanism including a selector magnet and permutation and combination mechanism controlled thereby, a bell crank mechanism pivotally mounted on said frame structure, a trip plunger reciprocally mounted in said frame structure and abutting against said bell crank mechanism for operating said bell crank mechanism, a. magnetic frame carried by said frame structure, an electromagnetic operating mechanism independent of said selector magnet supported by said magnetic frame, an armature controlled by said electromagnetic operating mechanism and an adjustable member carried by said armature in axial alignment with said trip plunger forshifting said trip plunger into operative position with respect to said bell crank when said electromagnetic operating mechanism is energized in alternate timed relation to the operation of said selector magnet.

9. In a printing telegraph apparatus a frame structure, a mechanical selector mechanism including a selector magnet and permutation and combination mechanism controlled thereby, a bell crank mechanism pivotally mounted on said frame structure, a trip plunger reciprocally mounted in said frame structure and abutting against said bell crank mechanism for operating said bell crank mechanism, 'a magnetic frame carried by said frame structure, an electromagnetic operating mechanism independent of said selector magnet supported by said magnetic frame, an armature controlled by said electromagnetic operating mechanism, an adjustable member carried by said armature in axial alignment with said trip plunger for shifting said trip plunger into operative position with respect to said bell crank when said electromagnetic operating mechanism is energized in alternate timed relation'to the operation of said selector magnet, and adjustable means carried by said frame structure and adjustable withrespect to said armature for limiting the movement of said armature both toward and away from said electromagnetic operating mechanism for controlling the path of travel of said trip plunger.

10. In a printing telegraph apparatus a frame structure, a mechanical selector mechanism including a selector magnet and permutation and combination mechanism controlled thereby, a, bell crank mechanism pivotally mounted on said frame structure, a trip plunger reciprocally mounted in said frame structure and abutting against said bell crank mechanism for operating said bell crank mechanism, a vmagnetic frame carried by said frame structure, an electromagnetic operating mechanism independent of said selector magnet; supported. by said magnetic frame, an armature controlled by said electromagnetic operating mechanism, an adjustable member carried by said armature in axial alignment with said trip plunger for shifting said trip plunger into operative position with respect to said bell crank when said electromagnetic operating mechanism is'energized, adjustable means carried by said frame structure andadjustable with respect to said armature for 'limiting the movement of said armature both toward and away from said electromagnetic operating mechanism for controlling the pathof travel of said trip plunger in alternate timed relation to'the 13 operation of said selector magnet and spring means mounted on said frame structure and connected with said armature for tensioning said armature in a direction away from said electromagnetic operating mechanism preparatory to a thrust movement toward said trip plunger.

11. In a telegraph mechanism including a frame structure, a trip latch pivotally mounted on said frame structure, a stop screw adjustably positioned in said frame structure in adjustable alignment with one end of said trip latch for limiting the angular movement of said trip latch, locking means associated with said stop screw for maintaining said stop screw in a predetermined adjusted position, a bell crank pivotally mounted with respect to said frame structure and having one end thereof in engagement with the end of said trip latch opposite the end thereof engaged by said adjustable stop, a trip plunger reciprocative in said frame structure and engageable with the opposite end of said bell crank, a mechanical selector carried by said frame structure, a pair of coacting electromagnetic actuators carried by said frame structure, separate armatures operated by each of said electromagnetic actuators, one of said armatures operating said mechanical selector, an adjustable member carried by the other of said armatures and axially aligned with said trip plunger for imparting linear movement'to said trip plunger, a stop pawl operative beneath said trip latch, spring means for normally urging said trip latch into engagement with said stop pawl, one of said electromagnetic actuators operating to move said last mentioned armature into a position in which the adjustable member adjacent the end thereof axially abuts said trip plunger for moving said trip plunger against said bell crank and operating said bell crank against said trip latch for shifting said trip latch out of engagement with said stop pawl against the resistance of said spring means to a limiting position determined by abutment thereof with the adjustable stop carried by said frame means'whereby said stop pawl is freed for independent movement intermediate the operation of said mechanical selector by the other of said electromagnetic actuators.

12. In a printing telegraph system, a line relay, control means and opposite contactors associated with said relay, a mechanical selector mechanism including a selector magnet connected with one of said contactors, a permutation and combination control mechanism, an adjustable range mechanism and a rotary control mechanism associated with said mechanical selector mechanism, a trip latch for controlling the operation of said rotary control mechanism, a selector armature controlled by said selector magnet for controlling said permutation and combination control mechanism, and electromagnetic means auxiliary to said selector magnet and connected with the other of said contactors for controlling the operation of said trip latch in time periods intermediate the time periods when said selector magnet is energized, said selector magnet and said electromagnetic means being disposed on opposite sides of said adjustable range mechanism.

13. In a printing telegraph system, a line relay, control means and a pair of contactors associated with said relay, a mechanical selector mechanism including a selector magnet connected with one of said contactors, an armature operative thereby and movable from an energizing to a deenergiztrol mechanism and a rotary control mechanism associated therewith, a trip latch for controlling the operation of said rotary control mechanism, electromagnetic means auxiliary to said selector magnet connected with the other of said contactors for controlling the operation of said trip latch, the magnetic path of movement of the contactor of said line relay being less than the magnetic path of movement of the armature of said selector magnet, and said auxiliary electromagnetic mechanism being operative in advance of the restoration of said armature to its limiting deenergized position.

14. In an electric selecting mechanism, a two position relay operative to alternately close a circuit through either of two contactors, a set of mechanical selectors, an electromagnet connected with one of said contactors, an armature op-- erated thereby from a selecting position to a deenergized limiting stop position for performing a mechanical selection operation, a rotary control mechanism, a trip latch plunger for governing the operation of said rotary control mechanism, an auxiliary electromagnet independent of said first mentioned electromagnet and connected to the other of said contactors having an arma- 'ture operative with respect to said trip latch plunger in timed relation to the operation of said selector magnet, said auxiliary electromagnet being energizable immediately following a me chanical selection operation of said first mentioned armature and before said first mentioned armature is returned to its limiting stop,

15. Printing telegraph apparatus comprising a mechanical selector including a selector magnet, a selector armature operated by said selector magnet and movable to an energized selecting position from a deenergized limiting position, and permutation and combination mechanism con" trolled thereby, a rotary control mechanism, a trip plunger governing the rotation of said rotary control mechanism, an auxiliary electromagnetic mechanism independent of said selector magnet for controlling the position of said trip plunger, and means for energizing said auxiliary electromagnetic mechanism in advance of the restoration of said armature from a mechanically selecting energized position to the deenergized limiting position.

16. Printing telegraph apparatus comprising a mechanical selector including a selector magnet, a selector armature operated by said selector magnet and movable to an energized selecting position from a deenergized limiting position, and permutation and combination mechanism controlled thereby, a rotary control mechanism, a trip plunger governing the rotation of said rotary control mechanism, an auxiliary electromagnetic mechanism independent of said selector magnet for controlling the position of said trip plunger, and means for energizing said auxiliary electromagnetic mechanism during the time period said selector armature is shifting from a selecting energized position to a deenergized limiting position.

17. Printing telegraph apparatus comprising in combination a line relay movable from a marking to a spacing position, a mechanical selector includin a selector magnet, a selector armature operated by said selector magnet and movable to an energized marking position from a deenergized spacing position, and permutation and combination mechanism controlled thereby, a rotary control mechanism, a trip plunger governing the ing position, apermutation and combination conrotation of said rotary control mechanism, an

auxiliary electromagnetic mechanism independent of said selector magnet for controlling the position of said trip plunger, and a circuit connected between the spacing side of said line relay and said auxiliary electromagnetic mechanism for energizing said auxiliary electromagnetic mechanism during the time interval that said selector armature is moving from marking to spacing position.

18. Printing telegraph appanatus comprising in combination a line relay movable from a marking to a spacing position, a mechanical selector including a selector magnet, a selector armature operated by said selector magnet and movable to an energized marking position from a deenergized spacing position, and permutation and combination mechanism controlled thereby, a rotary control mechanism, a trip plunger governing the rotation of said rotary control mecha nism, an auxiliary electromagnetic mechanism independent of said selector magnet for control lin the position of said trip plunger, the path of travel of said line relay between marking and spacing positions being substantially less than the path of travel of said selector armature from marking to spacing positions, and circuits interconnecting said line relay, selector magnet and auxiliary electromagnetic mechanism for energizing said auxiliary electromagnetic mechanism during the time interval that said selector armature is moving from marking to spacing position.

19. Printing telegraph apparatus comprising in combination a line relay movable from a marking to a spacing position, a mechanical selector including a selector magnet, a selector armature operated by said selector magnet and movable to an energized marking position from a deenergized spacing position, and permutation and combination mechanism controlled thereby, a rotary control mechanism, a trip plunger governing the rotation of said rotary control mechanism, an auxiliary electromagnetic mechanism independent of said selector magnet for controlling the position of said trip plunger, the path of travel of said line relay between marking and spacing positions beingsubstantially less than the path of travel of said selector armature from marking to spacing positions, a common source of potential for energizing both said selector magnet and said auxiliary electromagnetic mechanism, and circuits interconnecting said line relay and. said selector magnet and auxiliary elec tromagnetic mechanism for alternately energizing said selector magnet and said auxiliary electromagnetic mechanism from said common source according to the permutations and com- .binations of a signaling code.

-mechanism for controlling the position of said trip plunger, and circuits between said line relay, and the other ends of said selector magnet and the operating winding of said-auxiliary electromagnetic mechanism for alternately energizing said selector magnet and the operating winding of said auxiliary electromagnetic mechanism according to the permutations and combinations of a telegraphic code of two different electrical conditions extending through a definite number of successive time intervals for imparting movement to the movable armature of said auxiliary e1ectromagnetic mechanism prior to the completion of the operating stroke of the selector armature.

GRANT STANLEY SAYLOR. 

